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Comprehensive
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ball bearing a machine part made of a groove in the shape of a circle with metal balls that roll in it. A ball bearing lets an axle or other part move easily.
mouse in computer operation, a small hand-held device that can be moved on wheels or ball bearings on a surface to move the cursor on a screen, or that can be moved along the lines of a drawing to reproduce the drawing on a screen. [1/5 definitions]